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Effects file used by Star Wars Jedi Knight: Jedi Academy, a Star Wars Jedi game where the player chooses to follow the light or dark side; contains information that describes different effects that occur throughout the game.
The EFX file is used to store information about a variety of effects such as when a lightsaber hits another light saber (saber block), a lightsaber hits a person (creating "blood sparks"), or a lightsaber hits an object (cutting the object). Other effects contained within the EFX file includes explosions and "force" related effects like lightning. The EFX can also be opened and edited to create customized effects.